JPH08244161A - Gypsum particle board and its manufacture - Google Patents

Abstract

PURPOSE: To manufacture continuously gypsum particle boards regardless of size by forming a gypsum layer composed of dihydrate gypsum with foams formed on its surface layer and also forming a wood chip layer having a constitution of crushed wood chips arranged in order in a core layer, in which crushed wood chips are larger as they are closer to a core and smaller as they are away from the core, set inclinedly toward a surface layer. CONSTITUTION: Flowing gypsum liquid gw is prepared by adding water to hemihydrate gypsum powder (g), and a foaming agent A is added therein, and then flowed onto a coal plate 12 and smoothed horizontally. Then powdery wood chips cg to which hemihydrate gypsum powder (g) adheres are classified onto the fluid gypsum liquid gw . When the coal plate 12 is moved forward, the hemihydrate gypsum powder (g) is accumulated on the flowing gypsum liquid gw to which a foaming agent A is added at the rear of the coal plate, and as the plate moves forward, out of crushed wood chips cg to which the hemihydrate gypsum powder (g) adheres, smaller wood chips cg first and then larger wood chips c are accumulated successively in order. When the coal plate passes through a blow-off device 13, the chips are accumulated in the order of large wood chips cg , smaller wood chips cg and hemihydrate gypsum powder (g) to form a mat 1A. Then the mat 1A is pressed integrally, over which the gypsum liquid gw to which the foaming agent A is added is flowed, smoothed horizontally and cured to manufacture a gypsum particle board 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gypsum particle board suitable for an interior material such as a floor material, a wall or a ceiling, and a method for producing the gypsum particle board.

[0002]

2. Description of the Related Art Generally, a particle board formed by molding a wood piece into a plate shape with an adhesive such as a urea resin, a phenol resin, or a melamine resin, or a wood chip cement board formed by molding a wood piece into a plate shape using cement as a binder is known. ing. In addition, gypsum board containing 1 to 10% of natural fiber or chemical fiber as a reinforcing material is commercially available.

[0003]

However, the above-mentioned particle board has small specific gravity and high strength and is excellent in workability, but has a drawback that it is inferior in fire resistance and dimensional stability. Further, although the wood chip cement board and the gypsum board are excellent in fireproofness, they have drawbacks that they have large specific gravity, low strength, and low workability.

It has been attempted to form a wood piece into a plate shape using gypsum as a binder, but there is a problem that the adhesion between the gypsum and the wood piece is low and the strength and water resistance are lower than those of other competing products. is there. That is, gypsum is obtained by adding more water than water to be crystal water to hemihydrate gypsum to change it to dihydrate gypsum, but usually a mixed solution of hemihydrate gypsum and water is in a fluid state, When the wood chips are mixed with the mixed solution, they are hardened in a dumpling shape, so that it is difficult to uniformly mix them. In particular, it is extremely difficult to process the edges.

The present invention has been made in view of the above problems, and provides a gypsum particle board which is a composite material of gypsum and wood chips, which is suitable as an interior material, and the size of such a gypsum particle board. The present invention provides a method for producing a gypsum particle board that can be continuously produced regardless of the above.

[0006]

The gypsum particle board of the present invention has a gypsum layer composed of dihydrate gypsum in which bubbles are formed in the surface layer, and from the large crushed wood piece to the small crushed wood piece in the core layer toward the surface layer. It is characterized in that it has a wood chip layer that inclines in order.

In the method for producing gypsum particle board of the present invention, a fluid gypsum aqueous solution containing water and a foaming agent added to hemihydrate gypsum powder is poured and leveled horizontally, and then water is added to the semi-hydrated gypsum powder. By classifying the crushed wood pieces to which the water gypsum powder is attached, the hemihydrate gypsum powder is deposited on the surface layer, and the small ground wood pieces are sequentially deposited from the large crushed wood piece toward the surface layer to form the mat, Next, the mat is temporarily pressed, and then a fluid gypsum water solution in which water and a foaming agent are added to hemihydrate gypsum powder is flowed and leveled horizontally to be cured. .

[0008]

[Function] In the gypsum particle board of the present invention,
A high-density gypsum layer that has been made lighter by forming bubbles in the surface layer, the core layer is light, and by having a large rigid wood piece layer, respectively, the specific gravity is small compared to wood piece cement board or gypsum board, In addition to high strength, it has higher dimensional stability than particle board and excellent fire resistance. Further, it has good heat insulating properties and sound insulation properties, and can be easily processed and constructed on site, and is suitable for interior materials such as floor materials, inner walls, and ceilings.

Further, in the method for producing gypsum particle board of the present invention, a gypsum aqueous solution containing a foaming agent is poured and leveled horizontally, and then water is added to deposit a hemihydrate gypsum powder. After classifying the crushed wood pieces, and then temporarily pressing them, the plaster particle board suitable as an interior material is continuously irrespective of the size by pouring a gypsum water solution containing a foaming agent and leveling it horizontally to cure. In addition, it can be easily manufactured.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a gypsum particle board 1 of the present invention. This gypsum particle board 1
Is a gypsum layer 2 made of gypsum dihydrate having bubbles B on the surface
And a crushed wood piece layer 3 which inclines in order from the large crushed wood piece C to the small crushed wood piece C toward the surface layer in the core layer.
Are formed.

This gypsum particle board 1 has a small density of expansion and contraction and is excellent in dimensional stability as well as excellent in fireproofing because the gypsum particle board 1 is formed on the surface layer with a high density and is lightened by the air bubbles B. There are advantages. That is, the temperature does not exceed 100 ° C. until the water of crystallization contained in gypsum dihydrate is dehydrated, and a certain time can be secured before firing. Moreover, since the wood piece layer 3 that is light and has high rigidity is formed on the core layer, the specific gravity is low, the strength is high, the nail holding power is high, and the workability and construction at the site are excellent, and the heat insulating property is high. Excellent sound insulation. As a result, it is suitable for interior materials such as floor materials, walls and ceilings.

In order to manufacture such a gypsum particle board 1, first, wood, for example, lauan is cut with a chipper to a thickness of about 0.5 mm and a length of about 50 mm, and then,
Crush with a hammer mill. In addition, some large pieces of wood
Grind with a Pearlman mill. These crushed wood pieces have a water content of 100 to 13 without undergoing a drying process.
Adjust by adding water to 0%. And hemihydrate gypsum powder is made to adhere to these crushed wood pieces.

On the other hand, as shown in FIG. 2, hemihydrate gypsum powder g
Liquid gypsum water liquid by adding water to g _WAnd make
After adding the foaming agent A, flow it on the caul plate 12 and level it.
Level. Then, the powder to which the above-mentioned hemihydrate gypsum powder g is attached
Ground wood C_gLiquid gypsum water liquid g_WClassify on top. sand
That is, crushed wood piece C to which hemihydrate gypsum powder g is attached_gAnd half
Drop the mixture with water gypsum powder g from the hopper 11,
At that time, from the blowing device 13 in the front-back direction (the left-right direction in FIG. 2).
Direction), it contains water and hemihydrate gypsum powder g
Large crushed wood chip C with_gIs affected by air
Without falling, on the other hand, containing water, hemihydrate gypsum powder
Small crushed wood piece C with powder g attached_gBlows away
It is blown away, and hemihydrate gypsum powder g is blown away further
Will be.

When the caul plate 12 is moved forward (in the direction of the arrow in FIG. 2), the fluid gypsum water solution g to which the foaming agent A is added is rearward with respect to the moving direction of the caul plate 12.
_W hemi gypsum powder g is deposited over the grinding wood C _g of hemihydrate gypsum powder g is attached toward the front of
Among them, the small wood pieces C _g to the large wood pieces C _g are sequentially deposited. Then, when passing the blowing device 13, contrary to the above, a large piece of wood C _g , a small piece of wood C _g ,
Hemihydrate gypsum powder g will be deposited in this order. As a result, the hemihydrate gypsum powder g is first deposited on the fluid gypsum water solution g _W leveled on the caul plate 12, and then the small crushed wood pieces C _{g are} crushed to a large extent toward the core layer. Large pieces of crushed wood C after the pieces of wood C _g are deposited with an inclination
Small crushed wood pieces C _g are sequentially deposited from _g to the surface layer, and hemihydrate gypsum powder g is again deposited on the surface layer to form the mat 1A.

After this, the mat 1A is temporarily pressed, and a fluid gypsum water solution g _W containing the foaming agent A is flowed on the mat 1A to level it horizontally and cure it. During this time, the foaming agent A foams to form bubbles B, and at the same time, the hemihydrate gypsum powder g is the surplus water of the fluid gypsum aqueous solution g _W and the ground wood chips C.
capture moisture contained in the _g fluidized gypsum water solution g _W
At the same time, it changes into dihydrate gypsum G, and the gypsum particle board 1 is manufactured.

As a result, the gypsum particle board 1 which is excellent in fireproofness, dimensional stability, workability, and is lighter and has higher strength can be continuously and easily manufactured regardless of size. .

In particular, the surface of the gypsum aqueous solution g _W provides a dense and smooth surface, and when a corrugated board 12 is formed with an uneven pattern, the plaster particle board has a clear and beautiful surface with the uneven pattern. 1 can be manufactured.

By the way, in the above-mentioned embodiment, the hemihydrate gypsum powder g and the crushed wood pieces C _g to which the hemihydrate gypsum powder g is adhered are classified by using the wind force, but gravity sorting is used. You can also For example, as shown in FIG. 3, hemihydrate gypsum powder g and hemihydrate gypsum powder g from the hopper 11
It is also possible to form the mat 1A by dropping the crushed wood chips C _g to which is attached to the inclined plate 15 via the guide plate 14 and utilizing the difference in repulsive force. That is, the piece of wood C _{g that} has fallen on the inclined plate 15 bounces up and falls far,
The hemihydrate gypsum powder g slides along the inclined plate 15 and falls directly below the lower end edge thereof. Therefore, by flowing the fluid gypsum aqueous solution g _W containing the foaming agent A onto the caul plate 12 and leveling it horizontally, the caul plate 12 is moved to move in the moving direction of the caul plate 12. Hemihydrate gypsum powder g is deposited immediately below the lower end of the inclined plate 15 located on the rear side, and as the coal plate 12 moves, a small piece of wood C _g , a large piece of wood C _g , is deposited on the hemihydrate gypsum powder g that was previously deposited. The pieces of wood C _g are deposited in this order. Further, when passing over the other inclined plate 15, contrary to the above, large pieces of wood C _g , small pieces of wood C _g and hemihydrate gypsum powder g are deposited in this order.

Also in this case, hemihydrate gypsum powder g on the surface layer on the fluid gypsum water solution g _W to which the foaming agent A is added.
Are deposited, and the crushed wood pieces C _g from the large crushed wood pieces C _g to the small crushed wood pieces C _g are sequentially stacked on the core layer to form the mat 1A. Hereinafter, as described above, after the mat 1A is temporarily pressed, the fluid gypsum aqueous solution g _W containing the foaming agent A is again flowed on the mat 1A to level it horizontally and cure it to cure the gypsum particle board. 1 can be manufactured.

In addition to this, classification by sieving may be used, or these may be used in combination.

[0022]

As described above, in the gypsum particle board of the present invention, a high-density gypsum layer having air bubbles formed in the surface layer to reduce weight is provided, and a light and highly rigid wood chip layer is provided in the core layer. By doing so, the specific gravity is smaller and the strength is higher than the wood chip cement board and gypsum board,
It has higher dimensional stability and better fire protection than particle board. In addition, it has good heat insulation and sound insulation, and facilitates on-site processing and construction.

Further, in the method for producing gypsum particle board of the present invention, a gypsum aqueous solution containing a foaming agent is flowed to level it horizontally, and then water is added to deposit hemihydrate gypsum powder. After classifying the crushed wood pieces, and then temporarily pressing them, the plaster particle board suitable as an interior material is continuously irrespective of the size by pouring a gypsum water solution containing a foaming agent and leveling it horizontally to cure. In addition, it can be easily manufactured.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a gypsum particle board of the present invention.

FIG. 2 is an explanatory view showing a classification step when manufacturing the gypsum particle board of the present invention.

FIG. 3 is an explanatory view showing another classification step when manufacturing the gypsum particle board of the present invention.

[Explanation of symbols]

1 gypsum particle board 1A mat 2 gypsum layer 3 wood piece layer 11 hopper 12 call board 13 blowing device 14 guide plate 15 inclined plate G gypsum (dihydrate gypsum) g hemihydrate gypsum powder C crushed wood pieces C _g hemihydrate gypsum powder is attached Grinded wood chips g _W Gypsum water solution A Foaming agent B Bubbles

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location E04F 13/16 8913-2E E04F 13/16 A

Claims (2)

[Claims] 1. A gypsum layer made of gypsum dihydrate with bubbles formed on the surface layer, and a core layer having a wood piece layer that inclines in order from a large ground wood piece to a small ground wood piece toward the surface layer. Gypsum particle board. 2. A fluid gypsum water solution containing water and a foaming agent added to hemihydrate gypsum powder is flowed and leveled horizontally, and then water is added to classify ground wood pieces to which hemihydrate gypsum powder is adhered. By doing, while depositing hemihydrate gypsum powder on the surface layer,
A large crushed wood piece and a small crushed wood piece were sequentially deposited on the core layer toward the surface to form a mat, and then the mat was temporarily pressed, and then water and a foaming agent were added to the hemihydrate gypsum powder. A method for producing a gypsum particle board, which comprises flowing a liquid gypsum water solution, leveling the solution horizontally, and curing the solution.